/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Returns whether a curve's value is set, given its key
Returns true if the value is set, false otherwise.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=URigHierarchy) bool IsCurveValueSet ( [FRigElementKey](API\Plugins\ControlRig\Rigs\FRigElementKey) InKey ) const